The other options are what? Vendor shoulders from ToT rep without socket with hit/crit or dodge/hit, ToT normal shoulders (that you still need luck on) with crit/haste or dodge/parry both with 1 socket, or ToT tier shoulders, that have 2 sockets but a worse itemized hit/mastery. I'll keep my amazingly itemized "ilvl-padding" pvp shoulders thank you very much. PvP power socket bonuses happen, but not on all pieces and even if they do, the difference is pretty marginal anyway. If you would even go for the socket bonus in the first place on the PvE piece.
And yeah, eventually PvE items will win out because you can valor upgrade them. However, we're talking about gearing (new) characters here, who don't have infinite valor and probably won't waste the 1000 per week on upgrading their worst 522 pieces. Even more so if you consider they'll be buying 1 or 2 valor trinkets, which is the only thing you really shouldn't get from honor.
On top of all that, they're soooo easy to get it's ridiculous. Even if there's a 522 PvE item that is better in a certain slot, you still need luck to have it drop, compared to doing a handful of dungeons and be guaranteed to have a piece that will give you - say - 99.9% same output.